If it helps - it is a standard build Dell PC running windows Vista
Just read this:
"When MVT is run, it may immediately switch off the McAfee firewall (it did when I ran it). It may also disable the On-Access Scanner, otherwise known as mcshield. This is what it's supposed to do, so don't panic. You will of course then get the Your System Is At Risk pop-up from McAfee, and possibly (depending on your settings) a notification from Windows Security Center to the effect that there is no firewall currently operating. You should resist the urge to call up McAfee's Security Center to switch the firewall back on."
Sadly I did turn the firewall back on (maybe next time the software will warn you about this)
So currently the PC won't even process the bios
Any ideas ?
Try powering right off, including the power switch at the back if there is one or unplug from the mains, and leaving it that way for a few minutes, then plug in & power back on. The software isn't active during BIOS POST so there must be a conincidental hardware issue if BIOS isn't accessible either.